US Bridges

Local over W. Nishnabotna

PoorPosted for load

Shelby County, Iowa · 080381001 · Structure no. 000000000306220

Built
1926
99 years old
Condition
Poor
inspected June 2024
Type
Truss - Thru
Steel
Length
167 ft
1 main span
Daily traffic
21
2022 count
Owner
County
County Highway Agency

About this bridge

Local over W. Nishnabotna is a steel truss - thru carrying Local over W. Nishnabotna in Shelby County, Iowa. It was built in 1926, so it is 99 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 21 vehicles a day, projected to reach 21 by 2044. The structure is 167 ft (50.9 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLocal
CrossesW. Nishnabotna
Location080381001
RouteCounty Highway 0
CountyShelby County
StateIowa
Coordinates41.76095, -95.258
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating18 US tons
Inventory rating14 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length167 ft (50.9 m)
Longest span100 ft (30.5 m)
Deck width16 ft (4.8 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deck12 ft (3.8 m)

Traffic and service

Average daily traffic21 (2022)
Projected traffic21 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over W. Nishnabotna built?

It was built in 1926, making it 99 years old in 2025.

What condition is Local over W. Nishnabotna in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does Local over W. Nishnabotna carry?

About 21 vehicles per day (2022 count).

How long is Local over W. Nishnabotna?

The structure is 167 ft (50.9 m) long with a longest span of 100 ft (30.5 m) and a deck 16 ft wide.

Who owns Local over W. Nishnabotna?

It is owned by the County Highway Agency.